WM_DRAWITEM (in List Boxes) - Parameters

idListBox (USHORT)

Window identifier.

The window identity of the list box control sending this notification message.

pOwnerItem (POWNERITEM)

Owner-item structure.

This points to an owner-item structure; see OWNERITEM.

rc (BOOL)

Item-drawn indicator.

TRUE

The owner draws the item, so the list box control does not draw it.
FALSE
If the item contains text and the owner does not draw the item, the owner returns this value, and the list box control draws the item.

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